From 2017 season some IRS changes related with tax returns claiming the Earned Income Tax Credit or the Additional Child Tax Credit will appear. All tax returns will be delayed until mid-February. These changes were made due to refund frauds and identity thefts. There will be more time for IRS to check and make additional review on returns as taxpayers who were used to getting an early refund will receive it not earlier until at least February 15, 2017.
More information can be found at www.irs.gov/uac/as-holidays-approach-irs-reminds-taxpayers-of-refund-delays-in-2017